Ground spiral bevel gears ndi mtundu wa zida zomwe zimapangidwira kuti zizitha kunyamula katundu wambiri komanso kuti zizigwira ntchito bwino, zomwe zimawapangitsa kukhala oyenera kugwiritsa ntchito ntchito zolemetsa monga zosakaniza konkire.
Magiya apansi ozungulira bevel amasankhidwa kuti akhale osakaniza konkire chifukwa amatha kunyamula katundu wolemera, amapereka ntchito yosalala komanso yogwira ntchito bwino, komanso amapereka moyo wautali wautumiki wosakonza pang'ono. Makhalidwewa ndi ofunikira pakugwira ntchito kodalirika komanso kogwira mtima kwa zida zomangira zolemetsa monga zosakaniza konkire.